Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Facilitated diffusion can be differentiated from active transport except

  1. Energy does not required

  2. Show saturation effect

  3. Accumulation of molecule

  4. (1) and (3) both
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In facilitated diffusion ,special proteins help move substances across membranes without expenditure of  ATP energy. While in case of Active transport it uses energy to pump molecules against a concentration gradient .

In both case , transportation rate reaches a maximum when all of the protein transporters are being used (saturation).
So the correct option is 'One and three both' .

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

The process of facilitated diffusion is different from active transport due to

  1. Involvement of membrane protein

  2. Its response to protein inhibitors

  3. Being a downhill process

  4. Saturation of transport
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Facilitated diffusion and active transport both involve membrane proteins and exhibit saturation kinetics, but facilitated diffusion moves molecules down their concentration gradient without cellular energy expenditure, making it a downhill process.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

The physical process involved in the release of molecular oxygen from leaves is

  1. Diffusion

  2. Transpiration

  3. Osmosis

  4. Capillarity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diffusion is a slow process and is not dependent on a living system. Diffusion is very important to plants since it the only means for gaseous movement within the plant body. Intake of carbon dioxide and release of oxygen through stomata occurs through the process of diffusion. Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

................ is the change in the value of a quantity with change in another variable.

  1. Variant

  2. Valency

  3. Gradient

  4. Density
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gradient is the change in the value of a quantity with change in another variable. Example time, solute concentration, pressure potential, solute potential, etc.

Density is the degree of compactness of a substance.
Valency is the number of electrons an atom can donate, share or accept to achieve a stable octet.
Variant is a quantity that changes its value.
So the correct answer is 'Gradient'.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Which of the following prevents an ion to cross the plasma membrane via simple diffusion?

  1. Ions are too large.

  2. Ions carry a charge.

  3. Ions are hydrophobic.

  4. Ions do not produce a concentration difference.

  5. Ions cannot interact with membrane-bound proteins.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ions are small atoms or molecules carrying an electric charge. The core of plasma membrane is composed of nonpolar hydrophobic lipid tails and prevent simple diffusion of these charged particles. Thus, the correct answer is B. 

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

If the amount of an ion absorbed by a root hair cell at $0^{0}C$ is 5 gm and at $20^{0}C$ is 20 gm. The amount of this ion absorbed actively should be

  1. 25 gm

  2. 20 gm

  3. 15 gm

  4. 5 gm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

At 0 degree Celsius the respiration rate will be zero. At 20 degree Celsius only the respiration process will take place. Hence, the 5 gm initially absorbed is due to physical diffusion of mineral ions from a region of high to low concentration. Later on, respiration occurs, then extra 15 grams are actively absorbed.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Which of these is/are not a property of facilitated transport?
(a) Requires special membrane proteins
(b) Highly selective
(c) Uphill transport
(d) Requires ATP energy

  1. a and b only

  2. c and d only

  3. a and c only

  4. b and c only

  5. b and d only
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Facilitated transport or diffusion or passive-mediated transport can be defined as the process of spontaneous passive transport of molecules or ions across a cell membrane through the specific transmembrane integral proteins.
  • It does not require the ATP molecules and is the diffusion is downhill.
  • So, the correct answer is 'c and d only'.
Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Which does not pertain to facilitated transport?

  1. Uphill transport

  2. High selectively

  3. Transport saturation

  4. Requirement of special membrane proteins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Facilitated transport is the movement of molecules across a membrane through special transport proteins.

The movement is in accordance with the concentration gradient and hence a downhill transport.
Transport proteins provide high selectivity and transport only certain molecules.
Example: Ion channels, aquaporins, etc.
So the correct answer is 'Uphill transport'.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Choose the correct statement regarding facilitated diffusion:

  1. It is fast process

  2. Expenditure of ATP occurs

  3. Break down the concentration gradients

  4. Does not requires special membrane proteins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Facilitated diffusion is a passive transport process that uses specific membrane proteins to speed up the movement of molecules down their concentration gradient. It does not require ATP.